CAJ | 학술논문

文献采用数值模拟方式研究充满了纳米流体封闭腔内的瞬态自然对流.热边界条件为温度周期性变化的正弦函数.重点分析了在同一Ra下,正弦函数的振幅和频率(或周期)对纳米流体强化对流换热的影响;结果显示:随着热边界的正弦函数的振幅和频率变大,热边界的瞬态Nu数和平均Nu数也越大;同时还观察封闭腔内的漩涡中心,随时间变化周期性发生转移;这些结果对后期研究纳米流体的瞬态自然对流有很大的帮助.
문헌채용수치모의방식연구충만료납미류체봉폐강내적순태자연대류.열변계조건위온도주기성변화적정현함수.중점분석료재동일Ra하,정현함수적진폭화빈솔(혹주기)대납미류체강화대류환열적영향;결과현시:수착열변계적정현함수적진폭화빈솔변대,열변계적순태Nu수화평균Nu수야월대;동시환관찰봉폐강내적선와중심,수시간변화주기성발생전이;저사결과대후기연구납미류체적순태자연대류유흔대적방조.
This paper studies numerically the transient natural convection in an enclosure with nanofluids. Thermal boundary condition changes periodically with sine function. It is investigation that amplitude and frequency(or period)of sine function have effect in heat convection of nanofluids. The results show that the transient number and average number of Nu on the heat boundary increases with the increasing of amplitude and frequency;the center of eddy in the closure periodic moves with the time periodic passing. All those result can help the follow-up study of transient natural convection of nanofluids.